Letting the information displayed in '--auto' mode be available
as a command.
Simplify a bit the --auto mode handling.

Note:
- the WOW64 status of the debuggee used to be printed in system
  information, which is a bit ackward as system info shouldn't be
  tied to a given process.
- replaced it with supported guest machines (for the record, a
  64-bit only setup incorrectly returns i386 as supported guest;
  I guess we shouldn't care).
- now printing the wow64 status of a process when displaying an
  exception information instead.
Signed-off-by: Eric Pouech <epouech@codeweavers.com>